When an opponent’s monster declares an attack: Change as many Attack Position monsters your opponent controls as possible to face-down Defense Position, and if you do, the ones changed by this effect cannot change their battle positions.

Note that the name is still not translated into TCG. We need to wait to see its TCG name, whether it will be Avalanching or not.

_________________Calling me Kaze or Kazemachi is as legit as calling me Eria.

Heheh... gotta say this one is pretty dangerous. And yes. The effect fits the characteristic of Earth element in YGO. Cannot change the battle position in FD means they cannot be used for synchro or xyz (Yes... that's all I can think of. Outdated mindset huh?). This card makes Swords of Concealing Light completely obsolete too. This is also good for stall deck, I see. Which makes opponent's monster slot become clogged. At least Ground Collapse can be destroyed. This one however, can't.